The Contra Costa County breeding bird atlas has been completed. Below is an
index map of the county with its atlas blocks. Each block is referred to by its
coordinates, such as 625-215 for the block in the northeast corner of the map.
The breeding status of each species in the county is included below the map.

For information about the Contra Costa County Breeding Bird Atlas, contact Steve Glover
If you have comments, suggestions, etc. for this web site, contact Joel Herr

Click on a species to see its breeding status in each of the county’s
blocks.The
breeding occurrence of 164 species is shown here, 144 of which were confirmed
breeding in Contra Costa County. The display for each species is provided in
part by BBA
List software.For
information about birds in Contra Costa County all year, refer to the Contra Costa County
checklist or Steve Glover’s Guide to Finding Birds in
Contra Costa County.